/Engine/Source/Runtime/Engine/Classes/AI/Navigation/NavigationTypes.h
Helper function: returns unique ID number for custom links.
static [FNavLinkId](API\Runtime\Engine\AI\Navigation\FNavLinkId) GenerateUniqueId ( [FNavLinkAuxiliaryId](API\Runtime\Engine\AI\Navigation\FNavLinkAuxiliaryId) AuxiliaryId, [FGuid](API\Runtime\Core\Misc\FGuid) ActorInstanceGuid )